Assessing joint commitment as a process in great apes

Many social animals interact jointly, but only humans experience a specific sense of obligation toward their co-participants, a joint commitment. However, joint commitment is not only a mental state but also a process that reveals itself in the coordination efforts deployed during entry and exit phases of joint action. Here, we investigated the presence and duration of such phases in N = 1,242 natural play and grooming interactions of captive chimpanzees and bonobos. The apes frequently exchanged mutual gaze and communicative signals prior to and after engaging in joint activities with conspecifics, demonstrating entry and exit phases comparable to those of human joint activities. Although rank effects were less clear, phases in bonobos were more moderated by friendship compared to phases in chimpanzees, suggesting bonobos were more likely to reflect patterns analogous to human face management''. This suggests that joint commitment as process was already present in our last common ancestor with Pan.

Automated summary

Research shows that chimpanzees and bonobos exhibit entry and exit phases similar to humans in joint activities, demonstrating a process of joint commitment. Bonobos' phases are more influenced by friendship, reflecting patterns akin to human face management more than chimpanzees do. This suggests that the process of joint commitment was already present in our common ancestor with Pan.